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mlxsw: spectrum: Adjust headroom buffers for 8x ports 

The port's headroom buffers are used to store packets while they
traverse the device's pipeline and also to store packets that are egress
mirrored.

On Spectrum-3, ports with eight lanes use two headroom buffers between
which the configured headroom size is split.

In order to prevent packet loss, multiply the calculated headroom size
by two for 8x ports.

Fixes: da382875c6 ("mlxsw: spectrum: Extend to support Spectrum-3 ASIC")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2020-06-16 10:14:58 +03:00 committed by David S. Miller
parent b15bb8817f
commit 60833d54d5
4 changed files with 17 additions and 0 deletions
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2
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -978,8 +978,10 @@ int __mlxsw_sp_port_headroom_set(struct mlxsw_sp_port *mlxsw_sp_port, int mtu,
lossy = !(pfc || pause_en);
thres_cells = mlxsw_sp_pg_buf_threshold_get(mlxsw_sp, mtu);
mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, &thres_cells);
delay_cells = mlxsw_sp_pg_buf_delay_get(mlxsw_sp, mtu, delay,
pfc, pause_en);
mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, &delay_cells);
total_cells = thres_cells + delay_cells;
taken_headroom_cells += total_cells;

13
drivers/net/ethernet/mellanox/mlxsw/spectrum.h
View File

@ -374,6 +374,19 @@ mlxsw_sp_port_vlan_find_by_vid(const struct mlxsw_sp_port *mlxsw_sp_port,
return NULL;
}
static inline void
mlxsw_sp_port_headroom_8x_adjust(const struct mlxsw_sp_port *mlxsw_sp_port,
u16 *p_size)
{
/* Ports with eight lanes use two headroom buffers between which the
* configured headroom size is split. Therefore, multiply the calculated
* headroom size by two.
*/
if (mlxsw_sp_port->mapping.width != 8)
return;
*p_size *= 2;
}
enum mlxsw_sp_flood_type {
MLXSW_SP_FLOOD_TYPE_UC,
MLXSW_SP_FLOOD_TYPE_BC,

1
drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
View File

@ -312,6 +312,7 @@ static int mlxsw_sp_port_pb_init(struct mlxsw_sp_port *mlxsw_sp_port)
if (i == MLXSW_SP_PB_UNUSED)
continue;
mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, &size);
mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, i, size);
}
mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl,

1
drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
View File

@ -782,6 +782,7 @@ mlxsw_sp_span_port_buffer_update(struct mlxsw_sp_port *mlxsw_sp_port, u16 mtu)
speed = 0;
buffsize = mlxsw_sp_span_buffsize_get(mlxsw_sp, speed, mtu);
mlxsw_sp_port_headroom_8x_adjust(mlxsw_sp_port, (u16 *) &buffsize);
mlxsw_reg_sbib_pack(sbib_pl, mlxsw_sp_port->local_port, buffsize);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
}